Work on the WHO Essential Medicines Library is continuing. In its current format, it contains searchable versions of the 12th Model List and the WHO model formulary, and links to the Management Services for Health (MSH) International Drug Price Indicator Guide and the web site of the WHO Collaborating Centre on Drug Statistics Methodology, Oslo, Norway. A central "Medicine link page" (giving the International Nonproprietary Name (INN), dosage(s), ATC classification code number(s) and justification for inclusion) has been prepared for each item in the Model List and links to key indications, disease summaries, systematic reviews and WHO clinical guidelines. These will supplement the links to the Model List, the WHO model formulary and the INN web site, and to external web sites such as that containing details of the ATC classification system. It is expected that the developmental version will be available for public access during the course of 2003.